Hydraulic pumping apparatus



Oct. 29, 1935. F, AjLOWER 2,019,353

HYDRAULIC PUMPING APPARATUS Filed June '7. 1952 2. Sheets-Sheet l IN NTOR A BY 'WE A NEY Oct. 29, 1935.` F. A. LOWER HYDRAULIC? PUMPING' APPARATUS 2 Sheets-Sheet 2 Filed June 7, 1932 ATTORNEY Patented oet. 29, 1935 PATENT OFFICE APPARATUS y `Application June '1, 1932, .Serlal No. 615,811

icmm'. (caros-'41)- This invention relates to pumping apparatus and it -h'as particular reference to hydraulically operated pumps for oil and other wells.

The principal object of the invention is to pro-A vide a novel combination. or elements designed to actuate the pump rod assembly in the well and therebypump uid from the wellto storage.

Another object ofthe invention is to provide hydraulically operated pumping, equipment which is ofsimple and economical construction and' which will be dependable in service and require but little'attention while in operation.'

Still another object of the invention is to provide a uid reservoir and means for forcing uid therefrom under pressure into the pump cylinders, combined with automatic means for releasing the fluid from thepump cylinders and returnn ing it' to the uidreservoir at the end of the stroke. l g

Broadly, the invention comprehends the provision of hydraulic pumping equipment designed to obtain a true, perpendicular stroke of the polished rod, and thereby avoid the lateral stresses to which these rods are subjected when actuated by the old types of mechanical pumping equipment. Repeated stresses eventually cause the polished rod to break by reason of fatigue and allow the pump rod assembly to drop into the,

well, thereby necessitating an expensive fishing iob- With the foregoinglobjects as paramount, the

invention has particular reference. to its salient features of construction and arrangement oi!- companying drawings, wherein;

Figure 1 is a side elevation,

Figure 2 is aplan view of Figure 1, j

Figure 3 is a plan view on line 3-3 of Figure 5,

Figure 4 is an end elevational view with portions broken away, and- Figure 5 is a view in vertical section of the uid reservoir.

Continuing with a more detailed explanation of the drawings, I designates the vertical tubular casings disposedd on opposite sides of a well casing 3 and securely mounted on a base 4. The casings I are braced by means of the angularly disposed braces 5 and 6. A tubular' member 1 is mounted within each of the casings I. These members serve as motor cylinders for the pistons 8 which carrypiston rings 9. The pistons 8 extend up- 'Ihe polished rod I2 passes through the center of the crcsshead I 0 .but is prevented from moving downward relative to the cross head by the clamp I3.' The polishedl rod I2 extends downwardly from the crosshead I0, through the stuiill- I ing box I4 and into the casing 2.

Secured to the base 3 is a fluid 'reservoir 4I5 within which is located the iiuid pumping mechanism used to raise the pistons 8. This mech- `anism is driven by an electric motor I6 or any 10 other suitable source of power. The power is applied through a belt I1 to a pulley I8 which is keyed to the shaft I9 which is mounted within the reservoir I5 on bearings 20.

A plurality of cylinders 2l within the iluid rsl5 l ervoir I5 serve aspump cylinders for the pistons 22-which are actuated by the eccentrics 23. These eccentrics are keyed to the shaft I9 as show'n in Figure 5. The uid is free to pass into the cylinders 2| by way of the check valves '24, and to 20 leave the cylinders l2| by way ofthe checkvalves 25. The check valves 25 communicate with a manifold 26 which in turn communicates with the iiuid delivery pipe 21. This pipe terminates in a cross 28 from which iluid pipes 23 and 3|) com- 25 I municate with the base of the motor cylinders 1. Fluid is returned to the reservoir I5 from. the

motor cylinders 1 by way o! pipes 30 and 23,

cross 28, and pipes 3| and 32.

A rod 33 extends downwardly from the c ross 30 1 head I3 and through a slot a in a. valve control arm 34 in the pipe 3l.l An adjustable collar 36 islocated o n the rod 33`above the arm 34 and a similar collar 31 is located on the rod 33 below the arm 34. The rate of return of fluid to the 85 reservoir I5 is controlled by a, valve 38 in the pipe 32.

The operation isas follows: I When'power from the motor I6 is applied to the shaft I9 the eccentrics 23.cause the pistons 40 22 to reciprocate, thereby drawing uld in through the 'check valve 24 on the upstroke and discharging it under pressure on the down stroke through the check valve 25 land intothemanifold 26.

From here the fluid travels through pipe 21, cross 28- and pipes 23 and 30 into the motor cylinders 1 below the pistons 8 thereby causing an equal pressure to be exerted on each of the .pistons 8 which move upward, thus raising the cross head Ill and pumping the well through the medium `of thepolished rod I2 and the pump rod assembly. v

During the up stroke the valve 35 is closed. y' I but just before the cross head I0 reaches its extreme'upward position the collar 31 engages the 55 valve control arm 34 and a slight further upward movement actuates this armto open thn valve 35. When this is done the :duid within the cylinders 1 is returned to the reservoir I5 by way of pipes 30 and 29, cross 28 and pipes 3| and 32. Upon entering the reservoir I5 the fluid pours over the eccentrics 23', thereby keeping them thoroughly'lubricated. The valve 38 serves to partially choke the return path, thereby preventing too rapid a return of mechanism to the lower position which might result in damage to the moving parts. v

Just before the mechanism reaches the lowest position in the stroke, the collar 38 engages the arm 3l anda slight further movement closes the valve 35 and the cycle is repeated.

Manifestly, the construction shown is capable of considerable modification, and suchmodication as is considered Within the scope and meaning of the appended claim is also considered within the spirit and intent of the invention.

What is claimed is:

In a hydraulic system for transmitting reciprocatory motion-the combination comprising a fluid reservoir having a fluid inlet and a uid pressurev outlet, a fluid recirculating means comprising a series of horizontally alined, vertically dis- 5 posed piston cylinders in said reservoir each having fluid inlets open to said reservoir, a fluid manifold effecting communication between said vcylinder and said iiuid pressure outlet, pistons in said cylinders, a shaft journaled in bearings at 10 either end interiorly of said reservoir, a series of eccentrics xed to said shaft, Aone above each of said cylinders and having connection with each of said pistons to force uid from said cylinders and reservoir through said outlet, means forr rol5 tating said shaft to actuate said pistons, a valve having common connection with said iiuid inlet and said uid pressure outlet and operative at predetermined intervals to control said uid and to effect its return to said reservoir for recircu- 20 lation.

FREDRICK A. LOWER. 

